Lubricant composition containing alkali metal borate and stabilizing oil-soluble acid

Abstract

Disclosed is a lubricant composition containing an oil of lubricating viscosity having dispersed therein a particulate hydrated alkali metal borate and an effective amount oil soluble acid which stabilizes the composition against the adverse effects of water contamination.

What is claimed is: 
     
       1. A lubricant composition comprising an oil of lubricating viscosity having dispersed therein: (a) 0.1 to 60 weight percent of a particulate hydrated alkali metal borate and   (b) 0.01 to 5.0 weight percent of an oil soluble acid of the formula: ##STR3##  and R is an oil-solubilizing group containing at least 4 carbon atoms, and R' is H or an oil-solubilizing group containing at least 4 carbon atoms.   
     
     
       2. The lubricant composition of claim 1 having dispersed therein 0.1 to 2.0 weight percent of said oil soluble acid. 
     
     
       3. The lubricant composition of claim 1 wherein said acid is a carboxylic acid. 
     
     
       4. The lubricant composition of claim 3 wherein said carboxylic acid is selected from tetrapropenylsuccinic acid, oleic acid, and the naphthenic acid. 
     
     
       5. The lubricant composition of claim 1 wherein said acid is a phosphorus-containing acid. 
     
     
       6. The lubricant composition of claim 5 wherein said phosphorus-containing acid is dioleylhydrogenphosphate. 
     
     
       7. The lubricant composition of claim 1 wherein said acid is a sulfur-containing acid.